Published:2013/5/9 21:07:00 Author:muriel | Keyword: The VCR converter, 12V to 120V, 20 Watt
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Published:2013/5/7 22:09:00 Author:muriel | Keyword: The 8 Watt driver
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Published:2013/5/7 22:09:00 Author:muriel | Keyword: The 2 Watt driver
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Published:2013/5/7 22:08:00 Author:muriel | Keyword: 12 Volt, Fluorescent Lamp Drivers
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Published:2013/5/7 22:08:00 Author:muriel | Keyword: 12V input, 12V , battery charger
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Published:2013/5/7 22:08:00 Author:muriel | Keyword: DC-DC converters
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Published:2013/5/7 22:06:00 Author:muriel | Keyword: 13.8V , 20A , linear power supply
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Published:2013/5/7 22:05:00 Author:muriel | Keyword: Thermostat , room heater
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Published:2013/5/7 22:05:00 Author:muriel | Keyword: Resistor Network Solver, HP-67 Programmable Calculator
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Published:2013/5/7 22:03:00 Author:muriel | Keyword: Plant watering timer
If you are like me, you hate doing the same chores every day, all your life. As much as you can automate such things, you should automate them. One of these chores is watering every plant around my apartment, specially those on the balcony! Long ago I made a small gizmo that takes care of this chore. It also keeps the plants alive when I travel away for one or two months.
I simply installed a water hose with a solenoid valve (I used a standard replacement valve for washing machines), and poked thin copper tubes into the hose, leading to each pot. Those plants that require less water get thinner copper tubes. And then I used the following timer circuit to control the valve. Problem solved. The plants are happy. (View)
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Published:2013/5/7 22:02:00 Author:muriel | Keyword: Orrery
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Published:2013/5/7 22:02:00 Author:muriel | Keyword: Op-Amp Oscillator, HP-67 Programmable Calculator
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Published:2013/5/7 22:01:00 Author:muriel | Keyword: Op-Amp Gain & Offset, HP-67 Programmable Calculator
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Published:2013/5/7 21:59:00 Author:muriel | Keyword: A HV Arc Circuit
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Published:2013/5/7 21:59:00 Author:muriel | Keyword: Mini efficient coil launcher, disposable camera flash
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Published:2013/5/7 21:58:00 Author:muriel | Keyword: Marshmallow Bazooka
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Published:2013/5/7 21:58:00 Author:muriel | Keyword: Magnetic Gun
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Published:2013/5/7 21:57:00 Author:muriel | Keyword: Magic Lamp
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Published:2013/5/7 21:56:00 Author:muriel | Keyword: Modified LED Night Light
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Published:2013/5/7 21:52:00 Author:muriel | Keyword: Low-Sensitivity , Sallen-Key Filter , HP-67 Programmable Calculator
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